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Diagnostics
623
02/16 MN05013001Z EN
Diagnostics of faults inside and outside the device
The easySafety safety control relay monitors itself and also
the external wiring.
easySafety is able to detect faults during operation and
trigger an appropriate response. easySafety distinguishes
between three error classes:
• Class C
If an error does not impair the safety behaviour of
easySafety, the device remains in the RUN operating
mode. The error is signaled via a diagnostics contact.
Error example: Error in easyLink protocol or in easyNet.
• Class B
If an error does impair the behaviour of easySafety, but the
execution of the device's internal safety test routines is
unaffected by this, a safety circuit diagram STOP occurs.
The standard circuit diagram continues to be executed. All
device outputs are switched off.
Error example: There is an error present in the device's
external wiring, e.g. a short circuit due to faulty insulation
in the input circuit.
• Class A
If an error impairs the safety behaviour inside the
easySafety, both circuit diagrams are switched to STOP
(class A); for example: error in the device. All device
outputs are switched off.
The following table provides an overview of the behaviour of
the easySafety when an error occurs.
h
Use the test signal outputs T1 - T4 for optimum monitoring
of the external wiring,
a chapter “Connecting test
signal outputs”, page 57.